PHP implementation _php tutorial for converting WAV files to image files and displaying them in a page

PHP implements the method of converting a WAV file into an image file and displaying it in a page

The examples in this paper are the methods that PHP implements to convert WAV files into image files and display them in a page. Share to everyone for your reference. The specific analysis is as follows:

Requirements: Convert WAV files to PNG files and display them.

wav_to_png.php:

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21st 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63

function Wav_graph ($file, $f =0, $w =0) { Global $DATA _dir; if (!is_file ($file)) return 0; $fp = fopen ($DATA _dir. $file, ' R '); $raw = Fread ($fp, 36); $str = "; $header = Unpack (' a4riff/vsize/a4wav/a4head/vheadsize/vpcm/vchannels/vsamplerate/vbyterate/vblockalign/ Vsamplebits ', $raw); foreach ($header as $k = $v) $str. = $k. ': '. $v. '; Fseek ($fp, + $header [' headsize ']-16); $raw = Fread ($fp, 8); $data = Unpack (' a4data/vdatasize ', $raw); foreach ($data as $k = $v) $str. = $k. ': '. $v. '; $b = $header [' samplebits ']; $c = $header [' Channels ']; $l = $b * $c/8; Sample frame length in bytes $s = $data [' datasize ']/$l; Total number of samples $r = $header [' samplerate ']; if ($f) $h = POW (2, $b)/$f; Else {$h = $, $f = POW (2, $b-1)/$h;} if ($w = = 0) $w = Round ($r/1000); Default to show 1k sample frames per minute Header ("Content-type:image/png"); $im = Imagecreate ($s/$w, $h * $c * 2); Imagecolorallocate ($im, 0xFF, 0xFF, 0xff); White BG $color = imagecolorallocate ($im, 0, 0, 255); Black Imagestring ($im, 5, 5, 5, $STR, $color); $x = 0; $y = Array (); $yn = Array (); for ($i = 0; $i < $c; $i + +) $y [$i] = $h * $i + $h; $n = $l * $W; while (1) { if ($s = = 0) Break if ($s < $n) $n = $s; $samples = Fread ($fp, $n); if ($samples = = = FALSE) Break $packed = Unpack ("s*", $samples); foreach ($packed as $k = $v) { $cnt = ($k-1)% ($w * $l); if ($cnt > $c-1) Continue $yn [$CNT] = $h * $cnt + $h-$v/$f; Imageline ($im, $x, $y [$cnt], $x +1, $yn [$cnt], $color); $y [$cnt] = $yn [$cnt]; $x + +; } $s-= $n; } Imagepng ($im); Imagedestroy ($im); } Wav_graph (' getwave.wav '); ?>

As follows:

I hope this article is helpful to everyone's PHP programming.

http://www.bkjia.com/PHPjc/987722.html www.bkjia.com true http://www.bkjia.com/PHPjc/987722.html techarticle PHP implements a method of converting WAV files to image files and displaying them in a page This article describes the methods that PHP implements to convert WAV files into image files and display them in a page. Share to everyone ...

